摘要
针对深孔预裂爆破装药量大,传统炮泥封堵易发生“冲孔”的问题,提出以水泥浆为封堵材料,并对其合理封堵长度进行研究。基于水泥浆性能,假设凝固后的水泥浆与岩石为同一材料,阐述水泥浆封堵炮孔的作用机理;根据Starfield迭加法的基本思想,建立柱状药包等效多个球状药包计算模型,探究球状药包应力波衰减规律,计算球状药包在自由面的迭加拉应力;基于减弱爆破漏斗理论,以迭加拉应力与岩石抗拉强度相等为原则,推导封堵长度取值公式;利用数值模拟,分析了不同封堵长度下爆破后应力波的扩散范围与岩石的破碎范围;以新巨龙煤矿2302N工作面爆破法过大落差断层为背景,进行现场试验,借助钻孔成像仪观测炮孔周边岩层破碎情况。结合理论计算、数值模拟及现场试验确定水泥浆封堵长度为2.5 m。
Aiming at the problem of large charge in deep hole pre-splitting blasting and easy punching in traditional gun mud,the cement slurry was proposed as the sealing material,and the reasonable sealing length was studied.Based on the properties of cement slurry,and assumed that cement slurry and rock were the same material after solidification,the mechanism of cement slurry sealing gun hole was expounded.Based on the basic idea of superposition in Starfield,the calculation model of cylindrical charge packages equivalent to multiple spherical charge packages was established,the attenuation rule of stress wave of spherical charge packages was explored,and the stress of spherical charge packages on free surface was calculated.Based on the theory of weakening blasting funnel,the formula for determining the sealing length was derived based on the principle that the stress of jiajara is equal to the tensile strength of rock.By numerical simulation,the propagation of stress wave after blasting was analyzed,and the fracture range of rock in the inwards area of the orifice was analyzed.The oversized drop fault of 2302N working face blasting method in Xinjulong coal mine was taken as the background.Combining with theoretical calculation,numerical simulation and field test,the cement slurry sealing length was determined to be 2.5 m.
作者
王劲翔
王凯
李廷春
张浩
张宪堂
WANG Jin-xiang;WANG Kai;LI Ting-chun;ZHANG Hao;ZHANG Xian-tang(College of Civil Engineering and Architecture,Shandong Key Laboratory of Civil Engineering Disaster Prevention and Mitigation,Shandong University of Science and Technology,Qingdao 266590,China)
出处
《科学技术与工程》
北大核心
2020年第26期10690-10695,共6页
Science Technology and Engineering
基金
国家自然科学基金(41772299)。
关键词
深孔预裂
爆破
封堵长度
等效药包
数值模拟
deep hole pre-splitting
blasting
plugging length
equivalent charge
numerical simulation
